Bump version to v1.3.0

Changes since v1.2.0:

!123 (merged) Update rust-vmm dependencies (main) ← (update-deps)

!121 (merged) implement std::error::Error trait (main) ← (fix-impl-error)

!120 (merged) Show the nofile hard limit value in the warning me... (main) ← (fix-rlimit-warn)

!119 (merged) Do not create tmpdir and bind mount /proc/self/fd ... (main) ← (remove-tmp-dir-for-proc)

!116 (merged) Disable killpriv_v2 by default (main) ← (no-killpriv-default)

MR #116 (closed) is a change in behavior, disqualifying this one as a patch release. Bump minor number instead.

Signed-off-by: Sergio Lopez slp@redhat.com